Census Transportation Planning Products (CTPP)
Program OverviewMarch 11, 2010
Overview of the CTPP Program
• CTPP is an AASHTO sponsored data program funded by member state transportation agencies
• CTPP operates with support from FHWA, RITA, FTA, Census Bureau, MPOs and TRB
• The CTPP program includes: – Data products– Training and technical assistance– Research
• Designed for the transportation community
Applications of CTPP
• Performance measurement
• Modal share analysis• Environmental justice• FTA New Starts/Small
Starts• Travel Demand
Modeling
• Livability analysis• Corridor planning• Air quality modeling• Trend analysis• Descriptive statistics• Travel forecasting
CTPP Data Sources
• CTPP uses data from the US Census Bureau American Community Survey (ACS).
• The ACS replaced the decennial census “long form” and requires accumulation of data over multiple years for small area tabulation– 1 Year of data for places with 60,000+ people
– 3 Years of data for places with 20,000 + people
– 5 Years of data for smaller geographic areas, e.g. TAZs
Key CTPP Variables• Data on Households
– Size, income, vehicles per household• Data on Workers
– Age and gender, occupations, earnings• Data on Journey to Work
– Usual mode to work, commuting time, work departure time
• Data on Workplaces– Work locations, times of arrival at work
Key CTPP Products
• Transportation Profiles for state, county and place
• CTPP 3-Year Data Products– Data access and visualization tools
• CTPP 5-year Data Products– TAZ development– Data access and visualization tools
• National Data Products
Additional CTPP Products
• Training and technical support– On-call user support– Training classes and web seminars
• Research– Integration of data sources– Disclosure avoidance
• Sharing of best practices, successes, challenges and constraints
CTPP Program Activities and Costs
Develop specialized data products 63%Conduct research, training and outreach 21%Manage the program 3%Unallocated balance 12%
Total Program Costs $5,844,332
5-Year Program: 2007-2012
CTPP Oversight Board17 Voting Members – 9 States, 8 MPOs
10 Ex-Officio Members
• Jennifer Finch – Chair, CO• Jonette Kreideweis, Vice
Chair, MN• Laine Heltebridle, PA • Nathan Erlbaum, NY• Hui Wei Shen, FL• Paul Agnello, VA • Phillip Mescher, IA• Ahmad Jaber, UT• Ayalew Adamu, CA
• Kuo-Ann Chiao, NYMTC• Steven Gayle, BMTS• Mell Henderson, MARC• Arash Mirzaei, NCTCOG• Guy Rousseau, ARC• Clara Reschovsky,MWCOG• Pete Swensson, TRPC• Vacancy• Penelope Weinberger,
AASHTO, CTPP Program Manager
CTPP Oversight BoardEx-Officio Members
• Ed Christopher, FHWA• Melissa Chiu, Census
Bureau• Alison Fields, Census
Bureau• Rich Denbow, AMPO• Elaine Murakami, FHWA
• Robert Padgette, APTA• Alan Pisarski, Consultant• Steven Polzin, USF. CUTR • Nanda Srinivasan, TRB• Elaine Murakami, FHWA• John Sprowls, FTA
AASHTO Census Data Work Group With 30+ MembersCTPP Federal Technical Advisory Group
TRB Subcommittees– List Serve (830 Members) & Quarterly Newsletters
CTPP Accomplisments To Date
• State, Local and County Profiles for 2005-2007 are completed and posted at the AASHTO website– http://ctpp.transportation.org/profiles_2005-2007/ctpp_profiles.html
• 3-Year CTPP list has been finalized and approved by the Census Bureau
• Data access software development contract is in place
• Plans for a TRB Census Conference in 2011 are underway
CTPP Key Contacts
• Penelope WeinbergerAASHTO CTPP Program [email protected]
• Melissa ChiuCTPP Program CoordinatorCensus Bureau301-763-2421Extension [email protected]
http://ctpp.transportation.org
An Early CTPP Data Product
Ed Christopher Resource Center Planning TeamFederal Highway Administration
4749 Lincoln Mall Dr. Rm 600Matteson, IL 60443
ACS Data Profiles
Why do them? What good are they?
Foundation Building
Snapshot of Area
Quickly compare Between Areas
Begin to Understand Changes
Good introduction to the data
Easy to do!
What are they?
2000 Profiles (1990 and 2000 data)
2005 Profiles (1990, 2000 and 2005 ACS)
2005, 2006 and 2007 (2000 and 3-year ACS)
Data Summaries Focus on Transportation
Variables Resident and Workplace data Includes Significance Tests And MOEs for 2000 Data Various Geographies
WorkplaceResidence
2000 Long Form DataStates and all counties
2005 ACS (65K+ people)
States, Large Cities, MSAs and CSAs2005, 2006, 2007 ACS (20K+ people)
States, Counties and Places
Includes
What do the Profiles Include?
Note:
3-year ACS data is only available for areas with 20,000 or more residents
Where do you find the Profiles?
http://ctpp.transportation.org
Finding CTPP Profiles
http://download.ctpp.transportation.org/profiles_2005-2007/ctpp_profiles.html
3-Year Data Profiles
Read the Notes and Cautions
Let’s get the data
Selecting a Profile
Make Your Selections
and Click Submit
Where is Part 2 Profile 2?
Just Choose Your Profile and Click on It
What you get (Part 1, Profile 1)
What is going on here?
What you get (Part 1, Profile 1)
Mode To WorkMode to Work CollapsedTravel time to WorkDeparture time for WorkMean Travel time to Work
Vehicles available in HHMode to Work by Poverty statusMode to Work by Vehicles availableHH size by Vehicles available
3-Year Data Profiles
Wrapping up
Need to Brush up on significance testinghttp://www.edthefed.com/presentations/significance%20testing.ppt
Check out the Profiles for your area http://ctpp.transportation.org
Census Transportation Planning Products (CTPP)
Mar 11, 2010CTPP Snapshot Webinar
Journey to Work and Migration Statistics BranchHousing and Household Economic Statistics Division
U.S. Census Bureau
CTPP and ACS Schedule
June 2010 CTPP 2006-2008 released in text (.CSV) format
Sept 2010 CTPP 2006-2008 data access software completed
Dec 2010 ACS 2005-2009 standard products released
(tracts, block groups)
Spring 2011 TAZ 2010 Delineation
Summer 2012 CTPP 2006-2010 (tentative)
CTPP 2006-2008 Table Summary
NUMBER of Tables (excluding collapsed versions)
All 204
Part 1 Residence Tables 123
Part 2 Workplace Tables 56
Part 3 Commuting Flow Tables 25
Collapsed Versions of VariablesA “collapsed” version of a variable combines
categories on that variable Use of collapses is advantageous because … Due to disclosure protections, there is a
minimum of 3 unweighted records per cell for calculations of – Averages (e.g. mean travel time) – Aggregates (e.g. number of vehicles used)
Standard errors calculated by Census Bureau– ACS replicate weight SEs difficult to calculate– Standard errors are more accurate than when
combining categories and recalculating from published numbers
Means of Transportation (MOT) Collapses
An AASHTO task force defined MOT collapses for the CTPP
Collapses are designed to – Adapt to disclosure protection needs – Accommodate a variety of planning needs
in different types of geographic areas– Versions do not all fully nest – MOT (7) provides more detail on non-private
vehicle modes– MOT (6) provides more detail on carpools
Means of Transportation (MOT)- Full Version MOT (18)
1 Total
2 Drove alone 13 Bicycle
3 Carpooled, 2-people 14 Walked
4 Carpooled, 3 people 15 Taxicab
5 Carpooled, 4 people 16 Motorcycle
6 Carpooled- 5- or 6- people 17 Other method
7 Carpooled- 7 or more people 18 Worked at home
8 Bus, trolley bus
9 Streetcar, trolley car, light rail
10 Subway, elevated
11 Railroad
12 Ferryboat
Means of Transportation (MOT)- Collapsed Versions
MOT (11) MOT (7)1 Total 1 Total
2 Drove alone 2 Drove alone
3 Carpooled, 2-person3 Carpooled4 Carpooled, 3 or more people
5 Bus, trolley bus
4 Public transportation 6 Streetcar, light rail, subway
7 Railroad, ferryboat
8 Bicycle5 Bicycle or walked 9 Walked
10 Taxi, motorcycle, other method
6 Taxi, motorcycle, other method
11 Worked at home 7 Worked at home
Means of Transportation (MOT)- Collapsed Versions
MOT (6) MOT (4)1 Total 1 Total
2 Drove alone 2 Drove alone
3 Carpooled, 2-person3 Carpooled4 Carpooled, 3 or more people
5 Public transportation, bicycle,
walked, taxi, motorcycle, other
method
4 Public transportation, bicycle,
walked, taxi, motorcycle, other
method, and worked at home
6 Worked at home
Content- Means of Transportation
MOT (18) is used in univariate tablesOnly 5 characteristics are allowed to cross with
MOT, due to disclosure protectionsAn AASHTO tables task force selected:
– Travel time – Departure time from home /
arrival time at workplace– Vehicles available in household – Age– Household income
All 4 collapsed MOT versions are crossed by these 5 variables in all 3 Parts of the CTPP
Content- Journey-to-Work
Besides means of transportation, other commuting tables are included: – Travel time (minutes) – Departure time from home /
arrival time at workplace– Vehicles available in household – Number of vehicles and carpools used – Workers per carpool, vehicle ridership
For details, go to:www.fhwa.dot.gov/ctpp/acsdataprod.htm
Content- Other Information
Characteristic Examples
Socioeconomic Industry, occupation, poverty status, earnings, class of worker, usual hours worked per week, employment status
Social and demographic
Age, minority status/race/hispanic origin, length of U.S. residence, language spoken at home, school enrollment
Household Household size, number of workers, age of youngest child, number of people over 16, number of people under 18, linguistic isolation, lifecycle (family type)
Housing Tenure, units in structure, telephone availability, vacancy status
Urban/ rural residence - (Part 1 only)
CTPP 3-year Geography (only areas population size 20,000+)
Pt. 1 Residence Geography Pt. 2 Workplace Geography
Nation (US Total) * Nation (US Total) *
State * POW State *
State-County POW State-County
State-County-MCD (12 states only) POW State-County-MCD (12 states)
State-Place POW State-Place
State-PUMA5 POW State- POWPUMA
Metropolitan Statistical Area POW Metropolitan Statistical Area
MSA- Each Principal City POW MSA- Each Principal City
Worked in Canada
Worked in Mexico
Worked outside US/Canada/Mexico
* Nation and state also tabulated at geographic components.
CTPP 3-year Geographic Components* (only areas population size 20,000+)
Pt. 1 Residence Geography Pt. 2 Workplace Geography
Not a geographic component (Total) Not a geographic component (Total)
In a metro or micro area (CBSA) In a metro or micro area (CBSA)
Not in a metro or micro area Not in a metro or micro area
In a metro area In a metro area
In a metro area- principal city In a metro area- principal city
In a metro area- not in principal city In a metro area- not in principal city
Not in a metro area Not in a metro area
In a micro area In a micro area
In a micro area- principal city In a micro area- principal city
In a micro area- not in principal city In a micro area- not in principal city
Urban -
Rural -
* Geographic components only tabulated for nation and state.
CTPP 3-year Flow Geography (only areas population size 20,000+)
Part 3 Commuting Flows
From Home: To Work:State POW State
State-County POW State-County
State-County POW State-Place
State-County-MCD (12 states only) POW State-Place
State-County-MCD (12 states only) POW State-County-MCD (12 states only)
State-Place POW State-Place
State-PUMA5 POW State- POWPUMA
State-PUMA5 POW State-Place
MSA- Each Principal City POW MSA- Each Principal City
CTPP ResourcesFederal Highway Administration (FHWA)
www.fhwa.dot.gov/ctpp/Upcoming CTPP data products2000, 1990 CTPP data products
AASHTOctpp.transportation.org/Transportation profiles, training materials
Transportation Research Boardtrbcensus.com
Bureau of Transportation Statistics (BTS) www.transtats.bts.govCTPP 2000, CTPP 1990 data download
Information about the American Community Survey
www.census.gov/acs/Subscribe to the
ACS Alert
Web Site Improvements Training
New and revised content on ACS web siteACS Compass Series: Understanding the
the ACS (UTACS) Handbooks
Tutorials and Powerpoint slideswww.census.gov/acs/www/UseData/Compass/compass_series.html
Train the Trainer workshops at SDCs, regional offices, etc.
Data User Education: Target Audiences for ACS Compass and Other Materials
General Users
Businesses
High School Teachers
Media
Congressional Staff
State & Local Governments
Federal Agencies
Researchers
Rural Areas
PUMS Users
American Indians / Alaska Natives
PRCS (in Spanish)
U. S. Census Bureau
Melissa Chiu, CTPP Coordinator Journey-to-Work & Migration Statistics BranchHousing and Household Economic Statistics
www.census.gov/population/www/socdemo/journey.html
Getting Your CTPP 3-year data
On line (Web Based)
Table Extractor
Similar to CTPP 2000
Easy to Use
Downloadable ~ stand alone use
Mapping component
“Free” with registration
Additional Software Highlights
User saved sessions
Graphic and charting features
Variable grouping
MOE recalculation
Exportable data (xls, cvs, txt, dbf)
Training Tutorials
Much, much more
Presented to:
Presented by:
Transportation leadership you can trust.
CTPP 5-year Tabulation
TAZ Delineation
CTPP Community
Liang Long
March 11, 2010
51
The Schedule of TAZ Delineation Tasks
Task1: TAZ Business Rule Memo
TAZ Business Rules Technical Subcommittee established (Summer 2009)
Draft memo posted (December 2009)
Feedback (December 2009 – March 2010)
Final deliverable submitted to the Census Bureau (March 2010)
52
Task1: TAZ Business Rule Memo
Two levels of custom tabulation geographyI. Traffic Analysis Zone (TAZ): RECOMMEND 1,200
population
II: Transportation Analysis Districts (TAD): RECOMMEND 20,000 population
III: 1,200 and 20,000 are recommendations, NOT thresholds
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Task2: Organizing Geographic Responsibilities for TAZ
State DOT contact verified for TAZ delineation task (October 2009);
Agency responsibility spreadsheet due January 8, 2010;
Final review for the list (Fall, 2010)
Deliver the list to the Census Bureau for software distribution.
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NCHRP 08-79Producing Transportation Data
Products from the ACS that comply with Disclosure Rules
• Project schedule: Jan 2010-July 2011– Fast-track with final report due in July 2011– Need results to be applied to 2006-2010 ACS for
the 5-year CTPP (delivery in summer 2012)
• Westat, Tom Krenzke, PI• Budget: $550,000
Tasks already completed!
• NCHRP panel (Guy Rousseau of ARC is the chair) met to review the workplan with the contractor on January 26, 2010
• Westat met with CB DRB on February 1, 2010.– Westat has 2 programmers with “sworn status” who
will work on-site at Census Bureau’s office in Suitland Maryland
• VHB (Rich Roisman, Frank Spielberg) will be conduit for testing “real” compared to “synthetic” ACS tabulations for travel demand applications
Methods to Test
• Deterministic- limit size of TAZs, and limit variable classes
• Random error applied to – Pre-generated tables, or– Microdata (individually, or in combination)
• Small area estimation• Unit-level model• Imputation• Data swapping• Super-sampling• Additive noise
What is a credible method?
• Must be implementable at the CB– Must pass the DRB approval– SAS code which can be modified by CB ACSO staff– Computer processing time
• Interative processes must converge quickly• Bayesian approaches must not “run forever”
• Results must make sense to transportation analysts– Preserve the descriptive qualities (univariate tables
should be near match to “real” ACS)– Should not result in erroneous diagnosis for validating
home-based work trips in travel demand forecasting models.
CTPP Resources
• Please join the CTPP listserv (use “digest” to limit the emails)– http://www.trbcensus.com/maillist.html
• Websites: – AASHTO: http://www.transportation.org/ctpp– USDOT:
http://www.fhwa.dot.gov/planning/census/index.htm – TRB Census subcommittee
http://www.trbcensus.com/
Read the CTPP Status Reporthttp://www.fhwa.dot.gov/ctpp/status.htm
Key People for Technical Support and Training
• Penelope Weinberger, AASHTO– [email protected]
• Liang Long, Cambridge Systematics– [email protected]
• Melissa Chiu, US Census Bureau– [email protected]
• Ed Christopher, FHWA– [email protected]
• Elaine Murakami, FHWA– [email protected]
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